Change institute font on title page to author

beamerinnerthemetuhh.sty

@@ -193,7 +193,7 @@
       \node[outer sep=0, inner sep=0pt] at (178.816mm+72.75mm, \the\paperheight-104.902mm-23.177mm) {\includegraphics[width=148.59mm]{.theme_imgs/TUHH_building-a.pdf}};
       \usebeamercolor{tuhh teal}
       \draw[line width = 1pt, fg,fill=fg] (9.535mm+5.34mm, \the\paperheight-144.195mm) -- (128.27mm-9.535mm, \the\paperheight-144.195mm) {};
-      \node[outer sep=0, inner sep=0pt, fg] at (66.805mm, \the\paperheight-144.195mm-16pt) {\insertinstitute};
+      \node[outer sep=0, inner sep=0pt, fg] at (66.805mm, \the\paperheight-144.195mm-16pt) {\usebeamerfont{author}\insertinstitute};
 
       \useasboundingbox (0,0) rectangle(\the\paperwidth,\the\paperheight);
       \begin{beamercolorbox}{tuhh teal}